distance.py

def calculate_distances(self, starting_coordinates, ending_coordinates):
      calculated_distances = []
      for i in range(len(starting_coordinates)):
          val = str(starting_coordinates[i]).split(',')
          starting_tuple = (val[0], val[1])
          val_end = str(ending_coordinates[i]).split(',')
          ending_tuple = (val_end[0], val_end[1])
          if val_end[0] == "0.0" or val_end[1] == "0.0":
              calculated_distances.append(-1)
          elif val_end[0] == "0.5" or val_end[1] == "0.5":
              calculated_distances.append(-2)
          else:
              calculated_distances.append(distance.distance(starting_tuple, ending_tuple).km)
      return calculated_distances